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using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections;
public class DragPanel : MonoBehaviour, IPointerDownHandler, IDragHandler {
private Vector2 originalLocalPointerPosition;
private Vector3 originalPanelLocalPosition;
private RectTransform panelRectTransform;
private RectTransform parentRectTransform;
void Awake () {
panelRectTransform = transform.parent as RectTransform;
parentRectTransform = panelRectTransform.parent as RectTransform;
}
public void OnPointerDown (PointerEventData data) {
originalPanelLocalPosition = panelRectTransform.localPosition;
RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, data.position, data.pressEventCamera, out originalLocalPointerPosition);
}
public void OnDrag (PointerEventData data) {
if (panelRectTransform == null || parentRectTransform == null)
return;
Vector2 localPointerPosition;
if (RectTransformUtility.ScreenPointToLocalPointInRectangle (parentRectTransform, data.position, data.pressEventCamera, out localPointerPosition)) {
Vector3 offsetToOriginal = localPointerPosition - originalLocalPointerPosition;
panelRectTransform.localPosition = originalPanelLocalPosition + offsetToOriginal;
}
ClampToWindow ();
}
// Clamp panel to area of parent
void ClampToWindow () {
Vector3 pos = panelRectTransform.localPosition;
Vector3 minPosition = parentRectTransform.rect.min - panelRectTransform.rect.min;
Vector3 maxPosition = parentRectTransform.rect.max - panelRectTransform.rect.max;
pos.x = Mathf.Clamp (panelRectTransform.localPosition.x, minPosition.x, maxPosition.x);
pos.y = Mathf.Clamp (panelRectTransform.localPosition.y, minPosition.y, maxPosition.y);
panelRectTransform.localPosition = pos;
}
}
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